ObjectiveTo comprehensively evaluate the incidence of venous thromboembolism (VTE) after colorectal surgery.MethodsWe searched PubMed/Medline, Web of science, and Embase databases by computer, collected studies by using the combination of corresponding English keywords. Then, we screened literatures according to inclusion and exclusion criteria, and evaluated the quality of literatures by using Downs and Black tools. Finally, we used Stata 15.1 and R Project 3.4.1 for meta-analysis.ResultsA total of 15 studies (n=721 730) were included in the meta-analysis. The combined incidence of VTE after colorectal surgery was 2.26% [95% CI was (1.93%, 2.61%), P<0.000 1], and the incidence of VTE after adjusting for publication bias was 1.82% [95% CI was (1.53%, 2.13%), P<0.000 1]. Meta regression analysis revealed that patients’ age (P<0.000 1), smoking (P=0.000 4), open surgery (P=0.020 0), preoperative albumin level (P=0.023 6), and malignant tumor (P=0.036 4) were correlated with the incidence of VTE after colorectal surgery, which may be potential factors for heterogeneity.ConclusionsThe incidence of VTE after colorectal surgery is not insignificant. It is necessary for clinicians to be vigilant about the occurrence of VTE after colorectal surgery and provide appropriate preventive interventions in combination with patients’ own risk factors, disease-related factors, and surgical factors.
Abstract： Objective To study the changes of the cyclic adenosine monophosphate (cAMP) and protein kinase A (PKA) expression of isolated rat hearts after diazoxide preconditioning (DPC), and to explore the possible mechanism of cAMP signaling pathway in myocardial protection by DPC. Methods Isolated working heart Langendorff perfusion models of 40 Wistar rats were set up and were divided randomly into four groups. For the ischemia reperfusion injury(I/R) group (n=10), 30 min of equilibrium perfusion was followed by a 60 min reperfusion of KrebsHenseleit (K-H) fluid. The DPC group (n=10) had a 10 min equilibrium perfusion and two cycles of 5 min of 100 μmol/L diazoxide perfusion followed by a 5 min diazoxidefree period before the 30 min ischemia and the 60 min reperfusion of K-H fluid. The blank control group (control group, n=10) and the Dimethyl Sulphoxide(DMSO) group (n=10) were perfused with the same treatment as in the DPC group except that diazoxide was replaced by natriichloridum and DMSO respectively. The activity of creatine kinase (CK) in coronary outflow, the activity of malonyldialdehyde (MDA) and superoxide dismutase (SOD) in myocardium were detected. And the scope of myocardial infarction and the concentrations of myocardial cAMP and PKA were also assessed. Results Compared with the I/R group, the level of MDA for the DPC group decreased significantly (8.28±2.04 nmol/mg vs. 15.52±2.18 nmol/mg, q=11.761,Plt;0.05), the level of SOD increased significantly (621.39±86.23 U/mg vs. 477.48±65.20 U/mg, q=5.598,Plt;0.05). After a 30 min reperfusion, compared with the I/R group, the content of CK decreased significantly (82.55±10.08 U/L vs. 101.64±19.24 U/L, q=5.598, Plt;0.05) and the infarct size reduced significantly (5.63%±9.23% vs.17.58%±5.76%, q=6.176,Plt;0.05) in the DPC group. The cAMP concentration in the DPC group was much higher than that in the I/R group (0.64±0.07 pmol/g vs. 0.34±0.05 pmol/g, q=14.738,Plt;0.05), and PKA concentration was also much higher than that in the I/R group ［17.13±1.57 pmol/(L·min·mg) vs. 12.85±2.01 pmol/(L·min·mg), Plt;0.05］. However, there were no significant differences between the I/R group, DMSO group and the control group in the above indexs (Pgt;0.05). Conclusion DPC significantly improves the releasing of cAMP and PKA, decreases oxygen free radicals, and relieves myocardial ischemia reperfusion injury. The cAMP signaling pathway may be involved in triggering the process of myocardial protection mechanisms of DPC.
Objective To investigate the effect of ischemic preconditioning(IPC) on myocardial ischemic reperfusion injury(I/R) of elderly rats. Methods Fiftysix Wistar rats, of which there were 28 aged from 21-23months(elderly rat) and 28 aged from 4-5months(young rat), were used to build isolated heart perfusion Langendorff model. The rats were divided into 7 groups with random number table（8 in each group）: adult control group, adult I/R group, adult IPC group, elderly control group, elderly I/R group, elderly IPC group and elderly enhanced IPC group. The control group underwent a 90-min perfusion without any intervention; the I/R group underwent a 30-min equilibration period, then a 30-min ischemia and a 30-min reperfusion; the IPC group underwent a 10-min equilibration period, then a 5-min ischemia for twice and a 5-min reperfusion, after that a 30-min ischemia and [CM(158-3mm]a 30-min reperfusion; the enhanced IPC group underwent a 10-min equilibration period, then a 5-min ischemia for 4-times and a 5-min reperfusion, after that a 30-min ischemia and a 30-min reperfusion. The recovery rates of cardiac output(CO), left ventricular developed pressure (LVDP), the maximum rising and descending rate of left ventricular pressure (±dp/dtmax) after a 30-min reperfusion were compared among groups. The activity of creatine kinase (CK) in coronary outflow, the level of malonyldialdehyde (MDA) and superoxide dismutase (SOD) before ischemia and after a 30min reperfusion were detected. The myocardial infarction areas were compared among groups. Results After a 30min reperfusion, compared with adult I/R group, in adult IPC group CK reduced significantly(89.48±18.72 U/L vs. 115.76±16.72 U/L，q=6.061，Plt;0.01)，the level of MDA decreased significantly（9.53±3.44 nmol/ml vs. 16.84±2.29 nmol/ml，q=7.732，Plt;0.01)，the level of SOD increased significantly（584.7±122.62 U/ml vs. 429.46±85.24 U/ml，q=4.754，Plt;0.01)，the recovery rates of CO,LVDP,+dp/dtmax and -dp/dtmax increased ignificantly(78.69%±9.68% vs. 65.10%±8.63%，83.61%±8.46% vs. 67.23±8.68%，81.68±8.68% vs. 67.89%±6.89%，89.79%±7.78% vs. 66.79%±8.46%，Plt;0.01), the myocardial infarction areas reduced significantly (5.25%±4.33% vs. 14.75%±8.02%,q=7.458，Plt;0.01)。There was no statistical significance between elderly IPC group and elderly I/R group in the above indexes（Pgt;0.05）.However, There was statistical significances between elderly enhanced IPC group and I/R group. CK reduced significantly (88.60±28.32 U/L vs. 105.76±9.64 U/L，q=5.620，Plt;0.01)，the level of MDA decreased significantly（8.38±3.36 nmol/ml vs. 16.80±3.06 nmol/ml，q=7.500，Plt;0.01)，the level of SOD increased significantly（558.87±78.66 U/ml vs. 433.75±86.65 U/ml，q=7.335，Plt;0.01)，the recovery rates of CO,LVDP,+dp/dtmax and -dp/dtmax increased significantly (77.99%±10.02% vs. 66.26%±9.78%，85.59%±6.67% vs. 73.90%±6.66%，83.87%±9.98% vs. 68.90%±8.68%，86.01%±766% vs. 70.39%±7.98%，Plt;0.01)， the myocardial infarction areas reduced significantly (795%±6.32% vs. 1568%±10.36%,q=8.680， Plt;0.01). 〖WTHZ〗Conclusion The protective effect of IPC on I/R elderly rat hearts has weakened. The enhanced IPC is able to regain the protective effect of IPC on elderly rat hearts.
ObjectiveTo establish and validate a nomogram model for predicting the risk of new-onset postoperative atrial fibrillation (POAF) after isolated aortic valve replacement (AVR). MethodsThe clinical data of patients without atrial fibrillation (AF) who underwent isolated AVR in the General Hospital of the Northern Theater of the Chinese People's Liberation Army from June 2020 to June 2022 were retrospectively collected. Patients with AVR were divided into a POAF group and a non-POAF group according to whether POAF occurred within 7 days after surgery. The preoperative baseline data, preoperative blood indexes, preoperative color Doppler echocardiography and the heart rate variability (HRV) in 7-days Holter monitoring before surgery were analyzed. Logistic regression was used to analyze the preoperative risk factors for POAF and R language was used to construct a nomogram to predict POAF. The results were compared with the established AF model (POAF-AF score). ResultsA total of 191 patients were enrolled in this study, and 66 (34.55%) of them developed POAF within 7 days after the surgery. The age of the patients in the POAF group was 60.97±8.41 years and 16 (24%) were female, while the age of the patients in the non-POAF group was 54.65±11.85 years and 59 (47%) were female. Univariate and multivariate logistic regression analysis showed that age, sex, drinking history, chronic obstructive pulmonary disease, platelet accumulation and high frequency power were independently associated with POAF after the AVR. The nomogram of POAF was constructed by combining the above independent risk factors. We predicted the area under ROC curve (AUC =0.812) in the nomogram of POAF after simple aortic valve replacement. The model was internally verified by a 10-fold cross-validation resampling (AUC=0.757, Kappa=0.438). Compared with the POAF-AF score, the nomogram had a superior discrimination performance. ConclusionAge, sex, drinking history, chronic obstructive pulmonary disease, plateletocrit, and high frequency power are independent predictors for POAF after isolated AVR. The nomogram can be used as a practical tool to help clinicians predict the probability of individual POAF occurrence and take necessary preventive measures.
ObjectiveTo analyze the recovery rule of atrial contractility (AC) function after Maze Ⅳ procedure of valvular atrial fibrillation (AF).MethodsIn our hospital from March 2016 to April 2018, 103 patients who underwent cryoablation Maze Ⅳ procedure due to mitral valve lesions associated with persistent or long-term persistent AF were enrolled. There were 42 males and 61 females, with an average age of 58.5±9.1 years. Electrocardiogram and echocardiography were followed up at discharge and 1, 3, 6, 12 months after procedure. A multivariate Cox analysis of predictive factors for AC recovery was applied.ResultsAll the 103 patients were followed up for 1 year. The recovery rate of AC increased gradually after operation. It was not until 3 months after procedure that most of the right atrial contractility (RAC) was accompanied by synchronous recovery of the corresponding left atrial contractility (LAC, Kappa coefficient≥0.40, P<0.05). However, the coexistence of sinus rhythm (SR) and bilateral AC was not consistent well until 1 year after operation (Kappa coefficient≥0.40, P<0.05). One year after procedure, the recovery rates of SR and bilateral AC were 86.4% (89/103) and 66.0% (68/103) respectively. By Cox multivariate regression analysis, longer preoperative AF duration (P=0.040), larger preoperative left atrial diameter (LAD, P=0.003), and AC deletion 3 months after surgery (P=0.037) were predictive factors for AF recurrence in the middle and advanced stages (>3 months) after Maze surgery. At the same time, longer preoperative AF duration and larger preoperative LAD were also negative predictors of middle and late recovery of LAC and bilateral AC (All P<0.05). Receiver operating characteristic curve analysis showed that the best critical value of preoperative AF time and preoperative LAD for prediction of AC recovery was 37 months (sensitivity 99.6%, specificity 76.3%) and 60.5 mm (sensitivity 98.5%, specificity 78.9%), respectively.ConclusionThe recovery of AC after Maze procedure is a dynamic improvement process. Early recovery of AC is beneficial to the stable maintenance of SR in the future. Prolonged duration of AF and enlarged LAD have adverse effects on the outcome of Maze Ⅳ procedure.
Objective Explore the effect of remote ischemic preconditioning (RIPC) on preoperative heart rate variability in patients with heart valves. Methods From January 2022 to July 2022, screening was conducted among 118 patients based on inclusion/exclusion criteria. Fifty-eight patients were excluded, and 60 patients participated in this trial with informed consent and were randomly divided into a RIPC group (n=30) and a control group (n=30). Due to the cancellation of surgery, HRV data was missing. 7 patients in the control group were excluded, and 5 patients in the RIPC group were excluded, 23 patients in the final control group and 25 patients in the RIPC group were included in the analysis. Comparison of relevant indicators of heart rate variability (standard deviation of NN interval (SDNN), standard deviation of mean value of NN interval in every five minutes (SDANN), mean square root of difference between consecutive NN intervals (RMSSD), percentage of adjacent RR interval>50 ms (PNN50), low frequency component (LF), high frequency component (HF) and LF/HF) at 8 hours in the morning on the surgical day between two groups of patients. Results There was no statistical difference in baseline characteristics between the two groups, and there was no significant difference in heart rate variability 24 hours before intervention (P>0.05). After the intervention measures were taken, the comparison of the results of heart rate variability at 8 hours on the day of operation showed that SDNN and SDANN of patients in the RIPC group were higher than those in the control group, with statistical differences (P<0.05). Conclusion RIPC can stabilize the preoperative heart rate variability of patients undergoing cardiac valve surgery.
Objective To evaluate the effect of left atrial enlargement on atrial myocardial fibrosis degree and levels of the angiotensinⅡ (AngⅡ)/Rac GTPase activating protein 1 (Rac1)/signal transducersand activators of transcription 3 (STAT3) signaling pathways expressing in patients with persistent atrial fibrillation and rheumatic heart disease (RHD). Methods From March to December 2011, 30 patients with RHD who underwent prosthetic valve replacement in our hospital were enrolled, including 16 males and 14 females, aged 42-70 (56.9±6.8) years. Twenty RHD patients with persistent atrial fibrillation as a research group and ten RHD patients with sinus rhythm as a control group (group A) underwent transthoracic echocardiography and right atrial appendage (RAA) tissue samples were obtained from these patients during mitral/aortic valve replacement operation. The research group according to left atrial diameter (LAD) was divided into two groups, ten patients in each group: a group B with LAD of 50–65 mm and a group C with LAD of LAD>65 mm. For each sample, histological examination was performed by hematoxylin-eosin and Masson’s trichrome staining. Light-microscopic pictures of atrial tissues samples were stained and tissue fibrosis degree in each group was analyzed. AngⅡ concentration was measured by enzyme linked immunosorbent assay. Rac1 and STAT3 were measured by western blotting. Results LAD was significantly greater in AF patients with RHD than in the control group. Hematoxylin-eosin staining demonstrated highly organized arrangement of atrial muscles in the control group and significant derangement in both group B and group C with reduced cell density and increased cell size. Moreover, Masson’s trichrome staining showed that atrial myocytes were surrounded by large trunks of collagen fibers in both group B and group C, but not in the group A. There was a positive correlation between atrial tissue fibrosis and LAD. AngⅡ content was positively correlated with LAD. Similarly, Rac1 and STAT3 protein levels were found considerably higher in the group C and group B than in the group A with excellent correlation to LAD. Conclusion In patients with RHD complicated with persistent atrial fibrillation, the degree of atrial fibrosis and the expression level of AngⅡ/Rac1/STAT3 signaling pathways significantly increase with the left atrialenlargement.
ObjectiveTo evaluate the safety and efficacy of mitral valve surgery and cryoablation in elderly patients with mitral valve disease and persistent or long-term persistent atrial fibrillation.MethodsFrom May 2014 to July 2018, 144 patients with mitral valve diseases combined with persistent or long-term persistent atrial fibrillation in the Department of Cardiothoracic Surgery, General Hospital of Northern Theater Command were selected. Among them, there were 69 patients in a non-elderly group (<60 years) including 18 males and 51 females aged 52.07±5.56 years, and 75 patients in an elderly group (≥60 years) including 32 males and 43 females aged 65.23±4.29 years. A propensity-score matching (PSM) study was conducted to eliminate confounding factors. Both groups underwent mitral valve surgery and cryoablation at the same time. A 2-year follow-up was conducted after discharge from the hospital, and the perioperative and postoperative efficacy indexes were compared between the two groups.ResultsAfter PSM analysis, there were 56 patients in each group. The sinus rhythm conversion rate of the two groups at each follow-up time point was above 85%, and the cardiac function was graded asⅠorⅡ, which was significantly improved compared with that before the surgery, but there was no statistical difference between the two groups (P>0.05). Among the perioperative indicators of the two groups, the elderly group had more coronary artery bypass graft surgeries and longer postoperative ICU stay time compared with the non-elderly group (P<0.05), and the differences in other indicators were not statistically different (P>0.05).ConclusionThe mitral valve surgery and cryoablation in elderly patients with mitral valve diseases combined with persistent or long-term persistent atrial fibrillation are safe, and the short-term outcome is satisfactory.
Objective To compare the mid- and long-term clinical results of mitral valve plasty and mitral valve replacement in the treatment of functional mitral regurgitation (FMR). MethodsPatients with FMR who underwent surgical treatment in the Department of Cardiovascular Surgery of the General Hospital of Northern Theater Command from 2012 to 2021 were collected. The patients who underwent mitral valve arthroplasty were divided into a MVP group, and those who underwent mitral valve replacement into a MVR group. The preoperative clinical data, operative and perioperative data of the two groups were analyzed retrospectively, and the mid- and long-term follow-up results were compared. Results Finally 236 patients were included. There were 100 patients in the MVP group and 136 patients in the MVR group. The total follow-up rate was 100.0%, the longest follow-up was 10 years, and the average follow-up time was 3.60±2.55 years. There were 14 cumulative deaths in the MVP group and 19 in the MVR group. There was no statistical difference in baseline data between the two groups (P＞0.05). There was no statistical difference between the MVP group and the MVR group in the incidence of adverse events such as extracorporeal circulation time, aortic occlusion time, hospital stay time in the ICU, intraoperative blood loss, or hospitalization death (P＞0.05), but the time of mechanical ventilation in the MVP group was significantly shorter than that in the MVR group, and the difference was statistically significant(P=0.022).There were statistical differences in the left atrial diameter, left ventricular end-diastolic inner diameter, left ventricular end-systolic inner diameter and cardiac function grade between the two groups compared with those before surgery (P<0.05). The left ventricular ejection fraction in the postoperative MVP group was statistically higher than that before surgery (P<0.05), but there was no statistical difference in the postoperative MVR group compared with that before surgery (P>0.05). The LAD in the MVP group was reduced compared with the MVR group, and the difference was statistically different (P<0.05). The recurrence mitral regurgitation in MVP group was higher than that in MVR group, and the difference was statistically significant（10% vs.1.5%, P=0.003）. The cumulative survival rate (P=0.605) and mortality from cardiovascular events (P =0.880) were not statistically significant in the two groups by Kalan-Meier survival analysis. Conclusion The safety and medium- and long-term clinical efficacy of MVP in the treatment of FMR patients were better than MVR, and the left atrium and left ventricle diameter are statistically reduced, and cardiac function is statistically improved. However, the surgeon needs to be well aware of the indications for the MVP procedure to reduce the rate of MR recurrence.
ObjectiveTo evaluate the incidence of postoperative atrial fibrillation (POAF) after dexmedetomidine and diazepam in patients undergoing coronary artery bypass grafting (CABG). MethodsA retrospective cohort study was conducted in the patients who underwent CABG in the General Hospital of Northern Theater Command from October 2020 to June 2021. By propensity score-matching method, the incidence of POAF after dexmedetomidine and diazepam application in patients undergoing CABG was evaluated. ResultsFinally 207 patients were collected, including 150 males and 57 females, with an average age of 62.02±8.38 years. Among the 207 patients, 53 were treated with dexmedetomidine and 154 with diazepam before operation. There was a statistical difference in the proportion of hypertension patients and smoking patients between the two groups before matching (P<0.05). According to the 1∶1 propensity score-matching method, there were 53 patients in each of the two groups, with no statistical difference between the two groups after matching. After matching, the incidence of POAF in the dexmedetomidine group was lower than that in the diazepam group [9.43% (5/53) vs. 30.19% (16/53), P=0.007]. There was no death in the two groups during hospitalization, and there was no statistical difference in the main adverse events after operation. The ICU stay (21.28±2.69 h vs. 22.80±2.56 h, P=0.004) and mechanical ventilation time (18.53±2.25 h vs. 19.85±2.01 h, P=0.002) in the dexmedetomidine group were shorter. Regression analysis showed that age, smoking and diabetes were related to the increased incidence of POAF (P<0.05), and preoperative use of dexmedetomidine was associated with a reduced incidence of POAF (P=0.002). ConclusionFor patients undergoing CABG, the incidence of POAF with dexmedetomidine before operation is lower than that with diazepam. Preoperative application of dexmedetomidine is the protective factor for POAF, and old age, smoking and diabetes are the risk factors for POAF.